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(Click on image to enlarge)
Image courtesy of N.B.
Mildred wrote, "Labor Day 1921" — I think, but the last digit is nearly illegible; it could also be "4" or "6." Judging by the clothing, I'm inclined to think it is 1921.
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(1) Hulda Palm (wife of Peter). (2) Peter Palm (Anna Lindborg's brother). (3) Grandma Larson. (4) Anna Lindborg. (5) Mrs. Bowman. (6) Mabel Larson(?). (7) [first name unknown] Hanson(?). (8) Franklin Lindborg. (9) Gust Lindborg. (10) Helen Palm(?). (11) Gladys Lindborg. (12) Esther Palm(?). (13) Norma Lindborg. (14) June Bowman(?).
Location unknown.